Jason Heyward participated in pregame warm-ups for the first time since suffering a fractured jaw when he was hit in the face by a fastball.

Oakland Athletics (88-61)

Oakland is in line to win its second consecutive division title. (Photo by Ronald Martinez/Getty Images)

Yoenis Cespedes has soreness in his right shoulder , and is expected to undergo an MRI.

St. Louis Cardinals (87-62)

Kevin Siegrist has been a revolution for the St. Louis bullpen. (Photo by Dilip Vishwanat/Getty Images)

The Cardinals are battling down to the wire for the division title with non other than the Pittsburgh Pirates.

Los Angeles Dodgers (86-63)

Skip Schumaker's had a nice year off the bench for the Dodgers. (Photo by Dustin Bradford/Getty Images)

Dodgers activated Matt Kemp from the 15-day disabled list before Monday's series against Arizona, but he was not in the starting lineup.

Detroit Tigers (86-63)

The Tigers don't have a player with double-digit stolen bases. (Photo by David Maxwell/Getty Images)

Anibal Sanchez struck out 10 and and the Tigers shutout the White Sox 1-0.

Pittsburgh Pirates (87-62)

The Pirates with a huge series against Texas. (Photo by Joe Sargent/Getty Images)

Pirates shut down pitcher Wandy Rodriguez for the remainder of the season because of the ongoing pain in his pitching arm.

Cincinnati Reds (84-66)

Manny Parra's had a good year for the Reds. (Photo by Tasos Katopodis/Getty Images)

Reds activated Johnny Cueto from the disabled list Monday and will start the series opener against the Astros.

Tampa Bay Rays (81-67)

The Rays continue to hold onto the second Wild Card spot. (Photo by Hannah Foslien/Getty Images)

The Rays became only the second AL team with at least 15 shutouts in back-to-back years, which also tied the team record for number of shutouts in a year.

Texas Rangers (81-67)

Texas continues to slide. (Photo by Ronald Martinez/Getty Images)

Rangers have signed16-year-old Dominican infield prospect Yimmelvyn Alonzo for $350,000, he was No. 18 on MLB.com's Top International Prospects list.

Cleveland Indians (81-68)

Cleveland has the schedule in its favor, but will that be enough? (Photo by John Gress/Getty Images)

Josh Tomlin pitched in the Major League for the first time in over a year, returning from Tommy John surgery.

New York Yankees (79-71)

Alfonso Soriano has played out of his mind lately. (Photo by Rich Schultz/Getty Images)

Red Sox paid tribute to Mariano Rivera in a pregame ceremony at Fenway Park. They played hightlights of his 2004 ALCS Game 4 blow save before presenting him with a team signed No. 42 that appears on the Green Monster.

Baltimore Orioles (79-70)

Chris Davis joined the small 50-40 club, as in 50 homers and 40 doubles. (Photo by Tom Szczerbowski/Getty Images)

Orioles starter Miguel Gonzalez was injured in his last start with a right groin strain and the team listed him as day-to-day.

Kansas City Royals (78-71)

Luke Hochevar with a huge year, given where he started the season. (Photo by Ed Zurga/Getty Images)

Eric Hosmer was nominated to represent the Royals for the Marvin Miller Man of the Year Award.

Washington Nationals (79-70)

The Nationals have made things interesting, which is more than anyone expected. (Photo by Greg Fiume/Getty Images)

Denard Span to extend his career-best hitting streak to 26 games over the weekend against the Phillies.

Arizona Diamondbacks (75-73)

A disappointing season marred by injuries for Arizona. (Photo by Harry How/Getty Images)

Relief pitcher J.J. Putz could be activated from the disabled list soon.

Los Angeles Angels of Anaheim (72-77)

You wonder if, in pursuit of pitching, the Angels would move Chris Iannetta or Hank Conger. (Photo by Tom Szczerbowski/Getty Images)

Former Angel Vladimir Guerrero, is officially retiring from baseball nearly two years after playing his last game in the big leagues.

Philadelphia Phillies (69-80)

Ben Revere rebounded after a tough start, though he's offered little in the way of extra-base hits. (Photo by Hunter Martin/Getty Images)

Jimmy Rollins is about to become one of just 10 players in baseball history with 200 home runs and 400 stolen bases.

Toronto Blue Jays (68-81)

Maicer Izturis has struggled in year one of a multi-year deal. (Photo by Thearon W. Henderson/Getty Images)

Blue Jays closer Casey Janssen reached the 30-save plateau for the first time in his career.

San Francisco Giants (69-81)

Hunter Pence is having one of the best seasons of his career. (Photo by Stephen Dunn/Getty Images)

Hunter Pence hit the Giants' first grand slam of the season and drove in seven runs as the Giants routed the Dodgers 19-3.

Todd HeltonTodd Helton (Photo by Dustin Bradford/Getty Images)

San Diego Padres (68-80)

Ian Kennedy's time in San Diego has been a mixed bag. (Photo by Kevin C. Cox/Getty Images)

Former Padres closer Trevor Hoffman will be putting the Padres uniform back on, as he was named the team's upper level pitching coordinator and special assistant to general manager Josh Byrnes.

New York Mets (67-82)

Travis d'Arnaud has struggled at the plate so far. (Photo by Mike Stobe/Getty Images)

Mets All-Star third baseman David Wright says he plans to return to the the team this week and play the final couple of weeks of the season.

Seattle Mariners (66-83)

Reportedly Eric Wedge might be out in Seattle at season's end. (Photo by Dilip Vishwanat/Getty Images)

Hisashi Iwakuma is among one of the top pitcher in the majors with a WHIP (1.03), second in innings (203 2/3), fourth in ERA (2.87) and fifth in strikeouts-to-walk ratio (4.36) in the AL.

Milwaukee Brewers (65-83)

The Brewers don't have a great farm system but Khris Davis, Scooter Gennett, and Caleb Gindl have performed well. (Photo by Mike McGinnis/Getty Images)

The Brewers Sean Halton hit his first career walk-off home run in the bottom of the 9th inning to beat the Reds, 6-5, on Sunday.

Minnesota Twins (64-84)

Minnesota is limping to the finish line. (Photo by Hannah Foslien/Getty Images)

Joe Mauer shut down his workout early Wednesday as he felt concussion-like symptoms and was sent home.

Chicago Cubs (63-86)

Scott Baker is back, everyone. (Photo by Joe Sargent/Getty Images)

The Cubs plan to go with a six-man rotation for the next two turns.

Chicago White Sox (58-91)

The White Sox are having a miserable September. (Photo by Jonathan Daniel/Getty Images)

White Sox pitcher John Danks didn't have a good outing against the Indians allowing seven runs in four innings as the White Sox lost 14-3 on Thursday.

Miami Marlins (55-94)

Giancarlo Stanton can still punish a baseball. (Photo by Marc Serota/Getty Images)

Henderson Alvarez threw seven shutout innings and striking out five as the Marlins shutout the Mets 3-0 in Game 1 of Saturday's doubleheader.